image-png
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image-rs
Provide multi-theaded PNG encoding option via mtpng crate
https://github.com/brion/mtpng provides a multi-threaded PNG encoder that is competitive with libpng even in single-threaded configurations. It would be nice to be able to use it from image.
Since multi-threading "in the background" without user control can be undesirable and encoding ratio may suffer for very small images, it's probably best to provide it as a separate encoder type so that the API client would have full control over what's happening.
